The percentage of nitrogen in Magnesium nitride is

Options

A. 14
B. 28
C. 42
D. 56

Answer

To find the percentage of nitrogen in magnesium nitride (Mg3N2), we will follow these steps:

### Step 1: Determine the formula of magnesium nitride
The formula for magnesium nitride is Mg3N2.

### Step 2: Calculate the molar mass of magnesium nitride
- The molar mass of magnesium (Mg) is approximately 24 g/mol.
- The molar mass of nitrogen (N) is approximately 14 g/mol.

Now, we calculate the total molar mass of Mg3N2:
- There are 3 magnesium atoms:
\[ 3 \times 24 = 72 \text{ g/mol} \]
- There are 2 nitrogen atoms:
\[ 2 \times 14 = 28 \text{ g/mol} \]
- Therefore, the total molar mass of Mg3N2 is:
\[ 72 + 28 = 100 \text{ g/mol} \]

### Step 3: Calculate the mass percentage of nitrogen in magnesium nitride
To find the percentage of nitrogen in magnesium nitride, we use the formula:
\[ \text{Percentage of nitrogen} = \left( \frac{\text{mass of nitrogen}}{\text{molar mass of magnesium nitride}} \right) \times 100 \]
Substituting the values we calculated:
\[ \text{Percentage of nitrogen} = \left( \frac{28}{100} \right) \times 100 = 28\% \]

### Final Answer
The percentage of nitrogen in magnesium nitride is **28%**.

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